b-u bbb bbc bbe bbk bbl bbn bbu bcb bcc bce bck bcl bcn bcu be- beb bec bee bek bel ben beu bkb bkc bke bkk bkl bkn blb blc ble blk bll bln blu bnb bnc bne bnk bnl bnn bnu bub buc bue buk bul bun buu c-- cbb cbc cbe cbk cbl cbn cbu ccb ccc cce cck ccl ccn ccu ce- ceb cec cee cek cel cen ceu ckb ckc cl- clb clc cle clk cll cln clu cn- cnb cnc cne cnl cnn cnu cub cuc cue cuk cul cun cuu ebb ebc ebe ebk ebl ebn ebu ec- ecb ecc ece eck ecl ecn ecu eeb eec eee eek eel een ekb ekc eke ekl eku elb elc ele elk ell eln elu en- enb enc ene enk enl enn enu eu- eub euc eue eul eun kbb kbc kbe kbk kbl kbn kbu kcb kcc kce kck kcl kcn kcu ke- keb kec kee kek kel ken kkb kkc kke kkk kkl kkn kku kl- klb klc klu kn- knc kne knk knl knn knu kub kuc kue kuk kul kun kuu lbb lbc lbe lbk lbl lbu lcb lcc lce lck lcl lcn lcu leb lec lee lek lel len leu lkb lkl llb llc lle llk lll lln llu lnb lnc lne lnk lnl lnn lnu lub luc lue luk lul lun luu nbb nbc nbe nbk nbl nbn nbu ncb ncc nce nck ncl ncn ncu ne- neb nec nee nek nel nen neu nkc nke nkk nkn nku nlb nlc nle nlk nll nln nlu nnb nnc nne nnk nnl nnn nnu nub nuc nue nuk nul nun nuu ubb ubc ube ubk ubl ubn ubu ucb ucc uce uck ucl ucn ucu ueb uec uee uel uen ukb ukc uke ukk ukl ukn uku ulb ulc ule ulk ull uln ulu un- unb unc une unk unl unn unu uuc uue uun uuu